After the initial attack on the tower, Guran can be found just south-east of the tower's exit, being attacked by a bear. Once the bear is slain, you find out that he was tipping off an anonymous source about the Well's progress and you can either; kill him, let him go or persuade him to pay you off.

If you successfully persuade him to pay you, you will receive 104 gold coins and will be unable to interact with him any further. It's uncertain whether spending a point on Detect Hidden objects would affect this payout. If you decide to kill him, you will receive 207 experience points, but no loot.